I Just got my first bushmaster post ban A2 20” back after I did a trade for it back It has over 9,000 rounds through the barrel feeds and functions like a new rifle The finish on the rifle is still 100%. I replaced the Bolt carrier cam pin because it was starting to wear a groove in it and 3 or 4 firing pin cotter keys. When I hit 10,000 Rounds I will rebuild the bolt just for the hell of it and check the head space. I have some old USGI Mags with no finish and the springs are some what weak and it still feeds. I had a Couple FTF but it was not the rifles problem it was due to a crappy USA brand Magazine and the other FTF was due to a broken case when the back of the case got ripped off. I forgot I had to put a new set of hand guards and I had an Armalite Lower parts kit in the rifle before I sold it I took it out and put the Bushmaster Lower parts kit back in so there are only 2000 rounds through the lower parts kit... This Rifle has had over $1,400 of ammo pumped through it
And it still functions Great that goes to show you how well built these AR15 style rifles are. There was another member here who had a Colt that worked flawless and it had over 15,000 rounds through it then the ejector broke. 15,000 just think how many pounds of ammo was pumped through that rifle.